Neugrund crater

Boulder of gneiss breccia on Osmussaar, Estonia, apparently thrown there by the Neugrund impact.

Neugrund is a meteorite crater in Estonia. It is 8 km (5.0 mi) in diameter and is estimated to have been formed 470 million years ago in the Ordovician period. The crater is at the bottom of the sea and is not exposed at the surface. Boulders of gneissicbreccia found on the coast of Osmussaar, a nearby island, are believed to have been thrown there by the explosion.[1] It has been proposed that the Neugrund crater was created during the Ordovician meteor event when a hypothetical large asteroid transferred directly into a resonant orbit with Jupiter, which shifted its orbit to intercept Earth.[2][3][4]